var all_scores = {'杨璐':[130,143,144],
    '王雪':[132,135,144],
    '韩林霖':[127,139,142],
    '沙龙逸':[124,148,136],
    '李鉴学':[127,135,140],
    '韩雨萌':[128,133,138],
    '刘帅':[116,143,140],
    '康惠雯':[115,142,139],
    '刘钰婷':[116,139,135],
    '林世博':[116,142,129]};
//存储所有学生的姓名
var stu_names = ['杨璐','王雪','韩林霖','沙龙逸','李鉴学','韩雨萌','刘帅','康惠雯','刘钰婷','林世博'];
//求每个人三科的平均成绩，并打印'xx的平均成绩为：xx'

